Many UN documents address the specific ethical obligations of doctors and other health professionals, for example in Principles of Medical Ethics Relevant to the Role of Health Personnel, Particularly Physicians, in the Protection of Prisoners and Detainees Against Torture and Other Cruel, Inhuman, or Degrading Treatment or Punishment; Body of Principles for the Protection of All Persons under Any Form of Detention or Imprisonment; Standard Minimum Rules for the Treatment of Prisoners; and the Manual on the Effective Investigation and Documentation of Torture and Other Cruel, Inhuman or Degrading Treatment or Punishment (The Istanbul Protocol). These documents stress that it is a gross contravention of health care ethics to participate, actively or passively, in torture or other ill-treatment, or condone it in any way. Medical services must be provided for all patients without discrimination. They reinforce the ethical obligations of health professionals to act in the best interests of patients.